To supplement high school AP-prep classes, the Web site compiles material relevant to all three subjects, including video clips, exam questions, and practice problems.
作为对原有内容的补充，课程计划网站编辑整理了诸如视频剪辑、考试真题和练习题等与这三科相关的内容。
If you have a hard time understanding the material as the professor presents it, prep the concepts before class by reading the textbook.
如果你觉得教授罗列的材料难以理解时，那么先在课前通过阅读课本预习一下概念。
If you have a hard time understanding the material as the professor presents it, prep the concepts before class by reading the textbook.
如果你觉得教授罗列的材料难以理解时，那么先在课前通过阅读课本预习一下概念。
应用推荐